9n2=144

Solution for 9n2=144 equation:

9n^2=144

We move all terms to the left:

9n^2-(144)=0

a = 9; b = 0; c = -144;
Δ = b2-4ac
Δ = 02-4·9·(-144)
Δ = 5184
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}$

$\sqrt{\Delta}=\sqrt{5184}=72$
$n_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-72}{2*9}=\frac{-72}{18}
=-4
$
$n_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+72}{2*9}=\frac{72}{18}
=4
$